[lib] Remove commands that do not work in Yosemite
[lib] Remove commands that do not work in Yosemite

Thanks @grumble!

sophatvathana/dotfiles,christophermoura/dotfiles,mickael83/ubuntu-dotfiles,EDiLD/dotfiles,codelandev/init-setup,stevenirby/dotfiles-1,newtonne/dotfiles,christophermoura/dotfiles,pbrooks/dotfiles,oddlord/dotfiles,mickael83/ubuntu-dotfiles,zlot/dotfiles,newtonne/dotfiles,AlbertoElias/dotfiles,wingy3181/dotfiles,AlbertoElias/dotfiles,wingy3181/dotfiles,girishramnani/dotfiles,makabde/dotfiles,wingy3181/dotfiles,zlot/dotfiles,b-boogaard/dotfiles,girishramnani/dotfiles,makabde/dotfiles,khornberg/dotfiles,EDiLD/dotfiles